Entry characteristics of study subjects
| Characteristic | Controls | Viral wheezers | Difference in | |
| Proportions % (95% CI) | Mean (95% CI) | |||
| Categorical data | ||||
| Subjects n | 19 | 24 | ||
| Bronchodilator use | 0 (0) | 14 (58) | ||
| Sex M:F (% M) | 12:7 (63) | 6:18 (25) | 38 (8–68)* | |
| Atopy | 7 (37) | 15 (62) | 25 (−4–56) | |
| Continuous data | ||||
| Age yr | 28±5 | 24±5 | 4 (1–7)** | |
| Last URTI (months ago) | 7±3.8 | 5±3.7 | 2 (−1–4) | |
| FEV1 % pred | 95.6±13.2 | 85.8±11.4 | 9.8 (2.3–17.3)* | |
| PEF % pred | 118.8±41.2 | 104.3±21.8 | 14.4 (−6.9–34.2) | |
| Log2PC20 g·L−1 | 5.8±1.4 | 5.1±1.9 | 0.7 (−0.4–1.7) | |
Values are presented as n (%) for categorical data
mean±sd for continuous data
M: man
F: female
CI: Confidence interval
URTI: upper respiratory tract infection
FEV1: forced expiratory volume in one second
PEF: peak expiratory flow
PC20: provocative concentration of methacholine causing a 20% fall in FEV1
*: p<0.05
**: p<0.01